#title {
    color: #fff;
}
.png{
    width: 100px;
    height: 100px;
    background: url('../images//ok_two.png');
    background-size: cover;
}
.gif{
    width: 100px;
    height: 100px;
    background: url('../images//btn_save.gif');
    background-size: cover;
}
.jpeg{
    width: 100px;
    height: 100px;
    background: url('../images//btn_save.jpeg');
    background-size: cover;
}